"""Tests for gateway /compress user-facing messaging."""

from datetime import datetime
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from gateway.config import GatewayConfig, Platform, PlatformConfig
from gateway.platforms.base import MessageEvent
from gateway.session import SessionEntry, SessionSource, build_session_key


def _make_source() -> SessionSource:
    return SessionSource(
        platform=Platform.TELEGRAM,
        user_id="u1",
        chat_id="c1",
        user_name="tester",
        chat_type="dm",
    )


def _make_event(text: str = "/compress") -> MessageEvent:
    return MessageEvent(text=text, source=_make_source(), message_id="m1")


def _make_history() -> list[dict[str, str]]:
    return [
        {"role": "user", "content": "one"},
        {"role": "assistant", "content": "two"},
        {"role": "user", "content": "three"},
        {"role": "assistant", "content": "four"},
    ]


def _make_runner(history: list[dict[str, str]]):
    from gateway.run import GatewayRunner

    runner = object.__new__(GatewayRunner)
    runner.config = GatewayConfig(
        platforms={Platform.TELEGRAM: PlatformConfig(enabled=True, token="***")}
    )
    session_entry = SessionEntry(
        session_key=build_session_key(_make_source()),
        session_id="sess-1",
        created_at=datetime.now(),
        updated_at=datetime.now(),
        platform=Platform.TELEGRAM,
        chat_type="dm",
    )
    runner.session_store = MagicMock()
    runner.session_store.get_or_create_session.return_value = session_entry
    runner.session_store.load_transcript.return_value = history
    runner.session_store.rewrite_transcript = MagicMock()
    runner.session_store.update_session = MagicMock()
    runner.session_store._save = MagicMock()
    runner._session_db = None
    return runner


@pytest.mark.asyncio
async def test_compress_command_works_when_auto_compaction_disabled():
    """compression.enabled: false disables *automatic* compaction only.

    The gateway /compress handler has never gated on the flag — pin that
    contract (every manual-compress surface must allow manual compression
    regardless of the auto toggle, #64438) and the force=True cooldown
    bypass that manual compression relies on."""
    history = _make_history()
    compressed = [
        history[0],
        {"role": "assistant", "content": "compressed summary"},
        history[-1],
    ]
    runner = _make_runner(history)
    agent_instance = MagicMock()
    agent_instance.shutdown_memory_provider = MagicMock()
    agent_instance.close = MagicMock()
    agent_instance._cached_system_prompt = ""
    agent_instance.tools = None
    agent_instance.compression_enabled = False
    agent_instance.context_compressor.has_content_to_compress.return_value = True
    agent_instance.session_id = "sess-1"
    agent_instance._compress_context.return_value = (compressed, "")
    # Explicit non-lock-skip: MagicMock getattr would return a truthy mock.
    agent_instance._compression_skipped_due_to_lock = False

    def _estimate(messages, **_kwargs):
        return 100 if messages == history else 60

    with (
        patch("gateway.run._resolve_runtime_agent_kwargs", return_value={"api_key": "test-key"}),
        patch("gateway.run._resolve_gateway_model", return_value="test-model"),
        patch("run_agent.AIAgent", return_value=agent_instance),
        patch("agent.model_metadata.estimate_request_tokens_rough", side_effect=_estimate),
    ):
        result = await runner._handle_compress_command(_make_event())

    assert "disabled" not in result.lower()
    assert "Compressed:" in result
    agent_instance._compress_context.assert_called_once()
    assert agent_instance._compress_context.call_args.kwargs.get("force") is True


@pytest.mark.asyncio
async def test_compress_command_surfaces_aux_model_failure_even_when_recovered():
    """When the user's configured ``auxiliary.compression.model`` errors out
    but compression recovers by retrying on the main model, /compress must
    STILL inform the user.  Silent recovery hides broken config the user
    needs to fix."""
    history = _make_history()
    # Compressed transcript — normal successful compression, no placeholder.
    compressed = [
        history[0],
        {"role": "assistant", "content": "summary via main model"},
        history[-1],
    ]
    runner = _make_runner(history)
    agent_instance = MagicMock()
    agent_instance.shutdown_memory_provider = MagicMock()
    agent_instance.close = MagicMock()
    agent_instance._cached_system_prompt = ""
    agent_instance.tools = None
    agent_instance.context_compressor.has_content_to_compress.return_value = True
    # Fallback placeholder was NOT used — recovery succeeded.
    agent_instance.context_compressor._last_compress_aborted = False
    agent_instance.context_compressor._last_summary_fallback_used = False
    agent_instance.context_compressor._last_summary_dropped_count = 0
    agent_instance.context_compressor._last_summary_error = None
    # But the configured aux model DID fail before the retry succeeded.
    agent_instance.context_compressor._last_aux_model_failure_model = (
        "gemini-3-flash-preview"
    )
    agent_instance.context_compressor._last_aux_model_failure_error = (
        "404 model not found: gemini-3-flash-preview"
    )
    agent_instance.session_id = "sess-1"
    agent_instance._compress_context.return_value = (compressed, "")
    agent_instance._compression_skipped_due_to_lock = False

    def _estimate(messages, **_kwargs):
        if messages == history:
            return 100
        if messages == compressed:
            return 60
        raise AssertionError(f"unexpected transcript: {messages!r}")

    with (
        patch("gateway.run._resolve_runtime_agent_kwargs", return_value={"api_key": "***"}),
        patch("gateway.run._resolve_gateway_model", return_value="test-model"),
        patch("run_agent.AIAgent", return_value=agent_instance),
        patch("agent.model_metadata.estimate_request_tokens_rough", side_effect=_estimate),
    ):
        result = await runner._handle_compress_command(_make_event())

    # Compression succeeded
    assert "Compressed:" in result
    # No ⚠️ warning (that's reserved for dropped-turns case)
    assert "⚠️" not in result
    # But there IS an info note about the broken aux model
    assert "ℹ️" in result
    assert "gemini-3-flash-preview" in result
    assert "404" in result
    assert "auxiliary.compression.model" in result
    # The user's context is explicitly called out as intact
    assert "intact" in result
    agent_instance.shutdown_memory_provider.assert_called_once()
    agent_instance.close.assert_called_once()


@pytest.mark.asyncio
async def test_compress_command_in_place_skips_destructive_rewrite():
    """In-place compaction (compression.in_place / #38763) persists via
    archive_and_compact() inside _compress_context — the previous active rows
    are soft-archived and the compacted set inserted. Calling
    rewrite_transcript() afterwards would invoke
    replace_messages(active_only=False), DELETEing the just-archived rows
    (silent data loss, #61145). The handler must skip the rewrite and still
    report success."""
    history = _make_history()
    compressed = [
        history[0],
        {"role": "assistant", "content": "compacted summary"},
        history[-1],
    ]
    runner = _make_runner(history)
    runner._session_db = object()
    session_entry = runner.session_store.get_or_create_session.return_value
    runner.session_store.rewrite_transcript = MagicMock()

    agent_instance = MagicMock()
    agent_instance.shutdown_memory_provider = MagicMock()
    agent_instance.close = MagicMock()
    agent_instance._cached_system_prompt = ""
    agent_instance.tools = None
    agent_instance.context_compressor.has_content_to_compress.return_value = True
    # In-place compaction: session_id is UNCHANGED but marked as a success.
    agent_instance._last_compaction_in_place = True
    agent_instance.session_id = "sess-1"
    agent_instance._compress_context.return_value = (compressed, "")
    agent_instance._compression_skipped_due_to_lock = False

    def _estimate(messages, **_kwargs):
        if messages == history:
            return 100
        if messages == compressed:
            return 60
        raise AssertionError(f"unexpected transcript: {messages!r}")

    with (
        patch("gateway.run._resolve_runtime_agent_kwargs", return_value={"api_key": "***"}),
        patch("gateway.run._resolve_gateway_model", return_value="test-model"),
        patch("run_agent.AIAgent", return_value=agent_instance),
        patch("agent.model_metadata.estimate_request_tokens_rough", side_effect=_estimate),
    ):
        result = await runner._handle_compress_command(_make_event())

    assert "Compressed:" in result
    # The destructive rewrite must NOT run — archive_and_compact() already
    # persisted, and rewrite_transcript would wipe the archived rows.
    runner.session_store.rewrite_transcript.assert_not_called()
    assert session_entry.session_id == "sess-1"
    agent_instance.shutdown_memory_provider.assert_called_once()
    agent_instance.close.assert_called_once()


@pytest.mark.asyncio
async def test_compress_command_preserves_platform_and_gateway_session_key():
    """The temporary compression agent must carry the originating source's
    platform and stable gateway session key, matching a normal gateway turn.
    Without them ``_session_source_for_agent`` falls back to a default "cli"
    host source, so an external context engine misattributes the retained
    transcript tail and later duplicates it on resume (#50422)."""
    history = _make_history()
    runner = _make_runner(history)
    agent_instance = MagicMock()
    agent_instance.shutdown_memory_provider = MagicMock()
    agent_instance.close = MagicMock()
    agent_instance._cached_system_prompt = ""
    agent_instance.tools = None
    agent_instance.context_compressor.has_content_to_compress.return_value = True
    agent_instance.session_id = "sess-1"
    agent_instance._compress_context.return_value = (list(history), "")
    agent_instance._compression_skipped_due_to_lock = False

    with (
        patch("gateway.run._resolve_runtime_agent_kwargs", return_value={"api_key": "test-key"}),
        patch("gateway.run._resolve_gateway_model", return_value="test-model"),
        patch("run_agent.AIAgent", return_value=agent_instance) as mock_agent,
        patch("agent.model_metadata.estimate_request_tokens_rough", return_value=100),
    ):
        await runner._handle_compress_command(_make_event())

    assert mock_agent.call_count == 1
    _, kwargs = mock_agent.call_args
    # Platform preserved as the live turn's config key (TELEGRAM -> "telegram"),
    # not the unbound "cli"/"local" fallback.
    assert kwargs.get("platform") == "telegram"
    # Stable gateway session key preserved, identical to a normal gateway turn.
    assert kwargs.get("gateway_session_key") == runner._session_key_for_source(_make_source())
    assert kwargs["gateway_session_key"]


@pytest.mark.asyncio
async def test_compress_command_passes_tool_messages_to_compressor():
    """Tool results must reach _compress_context (#3854).

    Filtering the transcript to user/assistant-only starved the
    compressor's tool-result pruning — tool messages are usually the bulk
    of the context.
    """
    history = [
        {"role": "user", "content": "run it"},
        {
            "role": "assistant",
            "content": None,
            "tool_calls": [{"id": "t1", "type": "function",
                            "function": {"name": "x", "arguments": "{}"}}],
        },
        {"role": "tool", "content": "BIG RESULT " * 50, "tool_call_id": "t1"},
        {"role": "assistant", "content": "done"},
        {"role": "user", "content": "thanks"},
        {"role": "assistant", "content": "np"},
    ]
    runner = _make_runner(history)
    agent_instance = MagicMock()
    agent_instance.shutdown_memory_provider = MagicMock()
    agent_instance.close = MagicMock()
    agent_instance._cached_system_prompt = ""
    agent_instance.tools = None
    agent_instance.context_compressor.has_content_to_compress.return_value = True
    agent_instance.session_id = "sess-1"
    agent_instance._compress_context.return_value = (list(history), "")

    with (
        patch("gateway.run._resolve_runtime_agent_kwargs", return_value={"api_key": "test-key"}),
        patch("gateway.run._resolve_gateway_model", return_value="test-model"),
        patch("run_agent.AIAgent", return_value=agent_instance),
        patch("agent.model_metadata.estimate_request_tokens_rough", return_value=100),
    ):
        await runner._handle_compress_command(_make_event())

    args, _kwargs = agent_instance._compress_context.call_args
    passed = args[0]
    roles = [m.get("role") for m in passed]
    assert "tool" in roles, f"tool messages filtered out: {roles}"
    # Assistant tool_calls stubs (content=None) must survive too, or the
    # tool message would dangle without its call.
    assert any(m.get("tool_calls") for m in passed), "assistant tool_calls stub dropped"


